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AD7923 Datasheet(Hoja de datos) 7 Page  Analog Devices 

7 page AD7923 –7– REV. 0 TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The end points of the transfer function are zeroscale, a point 1 LSB below the first code transition, and fullscale, a point 1 LSB above the last code transition. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Offset Error This is the deviation of the first code transition (00 . . . 000) to (00 . . . 001) from the ideal, i.e., AGND + 1 LSB. Offset Error Match This is the difference in offset error between any two channels. Gain Error This is the deviation of the last code transition (111 . . . 110) to (111 . . . 111) from the ideal (i.e., REFIN – 1 LSB) after the offset error has been adjusted out. Gain Error Match This is the difference in Gain Error between any two channels. Zero Code Error This applies when using the twos complement output coding option, in particular to the 2 ¥ REFIN input range with –REFIN to +REFIN biased about the REFIN point. It is the deviation of the midscale transition (all 0s to all 1s) from the ideal VIN voltage, i.e., REFIN – 1 LSB. Zero Code Error Match This is the difference in Zero Code Error between any two channels. Positive Gain Error This applies when using the twos complement output coding option, in particular to the 2 ¥ REFIN input range with –REFIN to +REFIN biased about the REFIN point. It is the deviation of the last code transition (011. . .110) to (011 . . . 111) from the ideal (i.e., +REFIN – 1 LSB) after the Zero Code Error has been adjusted out. Positive Gain Error Match This is the difference in Positive Gain Error between any two channels. Negative Gain Error This applies when using the twos complement output coding option, in particular to the 2 ¥ REFIN input range with –REFIN to +REFIN biased about the REFIN point. It is the deviation of the first code transition (100 . . . 000) to (100 . . . 001) from the ideal (i.e., –REFIN + 1 LSB) after the Zero Code Error has been adjusted out. Negative Gain Error Match This is the difference in Negative Gain Error between any two channels. ChanneltoChannel Isolation ChanneltoChannel Isolation is a measure of the level of crosstalk between channels. It is measured by applying a fullscale 400 kHz sine wave signal to all three nonselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal. The figure is given worstcase across all four channels for the AD7923. PSR (Power Supply Rejection) Variations in power supply will affect the fullscale transition, but not the converter’s linearity. Power supply rejection is the maximum change in fullscale transition point due to a change in power supply voltage from the nominal value. See Typical Performance Characteristics. TrackandHold Acquisition Time The trackandhold amplifier returns into track mode at the end of conversion. Trackandhold acquisition time is the time required for the output of the trackandhold amplifier to reach its final value, within ±1 LSB, after the end of conversion. Signalto(Noise + Distortion) Ratio This is the measured ratio of signalto(noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental sig nals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent on the number of quantization levels in the digitization process; the more levels, the smaller the quantiza tion noise. The theoretical signalto(noise + distortion) ratio for an ideal Nbit converter with a sine wave input is given by: Signal to Noise Distortion N dB () ( . . ) += + 602 176 Thus for a 12bit converter, this is 74 dB. Total Harmonic Distortion (THD) Total harmonic distortion (THD) is the ratio of the rms sum of harmonics to the fundamental. For the AD7923, it is defined as: THD dB VVVVV V () log = ++++ 20 2 2 3 2 4 2 5 2 6 2 1 where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. 
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